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Trivial cleanup: removing parameters/functions that are not used in producing
startup metrics (The RecordMainEntryPointTime() used to take wall clock time
into account, but now on all platforms wallclock time is not needed except for
executable start time).

Bug: 797762
Change-Id: I1242246ad6af2b4b3e955b0225144154084e568f
Reviewed-on: https://chromium-review.googlesource.com/1174548Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584015}